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Stantec Well Restoration and Well Destruction Report Stockton Charter Way Commingled Plume No. CP0057 November 15, 2011 2.0 PERFORMED SCOPE OF WORK 2.1 Site-Specific Health and Safety Plan As required by the OSHA "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120) and by California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), Stantec prepared a Site-specific Health and Safety Plan (HASP). At a minimum, the HASP defined the proposed field activities, described physical and chemical hazards that may be associated with the work, provided a map to the nearest emergency medical facility, and included material safety data sheets for hazardous chemicals that were used or produced during the work. A copy of the HASP have been available on-site at all times during field work. The field staff and subcontractors performing field activities have reviewed the HASP prior to beginning field operations at the Site. 2.2 Permitting Prior to well restoration activities, Stantec obtained well permits for restoring monitoring wells SMW20-83.5 and SMW-23 from the San Joaquin County Environmental Health Department (SJCEHD). Stantec also obtained well permits for SMW-7, SMW-18-80, and SMW-18-120 prior to well destruction activities. 2.3 Preliminary Field Activities On September 20, 2011, Stantec staff marked the monitoring well locations for Underground Service Alert (USA), notified USA North to identify underground facilities near the monitoring well locations, and notified the station manager regarding the well restoration and well destruction activities. On September 26, 2011, Stantec staff supervised Cruz Brothers Locators, of Santa Cruz, California (Cruz Brothers) conduct an underground survey to locate monitoring wells SMW20-83.5 and SMW-23 and identify underground facilities near monitoring wells SMW-7, SMW-18-80, and SMW-18-120. A station light underground wiring and conduit was identified approximately two and a half feet from well SMW-7. 2.4 Well Restoration Field Activities In preparation for the property redevelopment located at 378 West Charter Way east of former Texaco (Shell), WDC had previously lowered off-site wells SMW20-83.5 and SMW-23 by air- knifing the well borehole to approximately three feet below ground surface (bgs), cutting and capping each well extending above the air-knifed depth, covering with Morrison well vaults, and backfilling with sand and soil. The property located at 378 West Charter Way later had been redeveloped as a commercial store with the building and driveway in front of the property adjacent to West Charter Way and customer parking behind the store building. Cruz Brothers marked the location of wells SMW20-83.5 and SMW-23 on the driveway leading to the customer parking behind the store building. On October 4, 2011, WDC jackhammered and hand-dug the marked locations in attempt to exposed the previously lowered well SMW-23, Stockton Charter Way CP-Well Restoration and Well Destruction Report.doc 2